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Finding the Fourth Proportional to 408.79, 563.78 and 377.20

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Solution

The fourth proportional to 408.79, 563.78 and 377.20 is: 520.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.79 : 563.78 = 377.20 : x
  2. Step 2: Convert to fraction form
    408.79/563.78 = 377.20/x
  3. Step 3: Cross multiply
    408.79x = 563.78 × 377.20
  4. Step 4: Simplify right side
    408.79x = 212,653.11
  5. Step 5: Solve for x
    x = 212,653.11/408.79
  6. Step 6: Final answer
    x = 520.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.